Heavy Duty Spiral Staircase Kits

Standard Heavy Duty Kit includes a 3 1/2" OD center column, heavy duty 1/4" base plate, (11) 3/16" steel treads, (12) 3/4" solid round steel balusters, with a machined bottom and milled top countersunk holes for attachments to the 1 1/2" round steel handrail, continuous sleeve tread hubs, complete with fasteners and instructions of installation of the outdoor spiral stairs.

As part of our extensive line of wood spiral staircases, metal spiral staircases and custom staircases both in kit form and fully assembled - Stairways Inc. offers standard and custom heavy duty spiral stair kits and other Outdoor spiral Stairs, in both steel and aluminum. Heavy-duty spiral staircase kits are assembled in-house, and then dismantled and disassembled for economical shipment to you, the customer. Our disassembly process of these exterior spiral staircases also allows for easy reassembly on the job site, with the added advantage of a finished metal spiral staircase appearance and finish. Standard heavy-duty spiral stairs are available in steel or aluminum.

Exterior Spiral Staircases include:

  • Heavy Duty 1/4" Base Plate
  • 3.5" Outer Diameter Center Column
  • Continuous Sleeve Tread Hubs
  • Twelve (12) 3/4" Solid Round Steel Balusters, complete with machined bottoms and milled top countersunk holes for attachment to the 1.5" Round Steel Handrail
  • Eleven (11) 3/16" Steel Treads
  • Complete Set of Fasteners
  • Step-by-Step Assembly Instructions

Outdoor Spiral Staircases and Heavy-duty spiral stair kits are available in diameters from 40" to 72" ; tread sizes range from 18" to 34" , with landing sizes from 21" to 37" . Heavy-duty steel spiral staircase kits weigh from 403 pounds to 519 pounds; heavy-duty aluminum spiral stair kits weigh from 180 pounds to 275 pounds.
Optional handrails available with heavy-duty spiral staircase kits include:

Outdor Spiral Stair Options

  • 1.25" Round Steel, Aluminum or Brass
  • 1.5" Round Steel, Aluminum or Brass
  • 1.5" x 2" Square Solid Wood (Oak), or specify preference
  • 2" Round Solid Wood (Oak), or specify preference

Heavy-duty spiral stair kits produced by Stairways Inc. are more expensive, due to the special handling and manufacturing processes used in the construction of these exterior spiral staircase units. Another advantage to our heavy-duty spiral staircase kits is all parts that are used for fully assembled spiral staircases are available for heavy-duty spiral stair kits (except for balusters). No matter what your heavy-duty spiral staircase kit requirements are, Stairways Inc. can meet the needs of your specific application call us today for prompt customer service and more information on our outdoor spiral staircases!